CN111648437B

CN111648437B - Rainwater secondary use formula rainwater garden suitable for sponge city construction

Info

Publication number: CN111648437B
Application number: CN202010646017.XA
Authority: CN
Inventors: 熊忠武; 钱如南; 黄黎; 姜宇飞; 张蒂; 谢建飞; 王超; 王文静
Original assignee: Huilv Landscape Construction Development Co ltd
Current assignee: Huilv Landscape Construction Development Co ltd
Priority date: 2020-07-07
Filing date: 2020-07-07
Publication date: 2021-04-13
Anticipated expiration: 2040-07-07
Also published as: CN111648437A

Abstract

The invention belongs to the technical field of rainwater gardens, and particularly relates to a rainwater secondary use type rainwater garden suitable for sponge city construction, which comprises a pit body, a covering layer, a planting layer, a sand layer, a gravel layer and an overflow pipe, wherein a soil loosening unit is arranged in the sand layer, and after the rainwater secondary use type rainwater garden is used for a period of time, the sand layer on the left side is loosened through the soil loosening unit, so that the purification effect of the rainwater secondary use type rainwater garden is improved; when the sand layer is loosened, after the sand layer is dried in the sun, the auxiliary driving mechanism drives the mounting rotating shafts in the soil loosening units to rotate in a reciprocating manner in sequence; the installation pivot is rotatory to drive two running rollers round installation pivot axis rotatory, and the running roller carries out the rotation round the rotatory in-process of installation pivot simultaneously, through the rotation of running roller with round the rotation of installation pivot to the sand bed loosen the soil and turn over native.

Description

Rainwater secondary use formula rainwater garden suitable for sponge city construction

Technical Field

The invention belongs to the technical field of rainwater gardens, and particularly relates to a rainwater secondary use type rainwater garden suitable for sponge city construction.

Background

The rainwater garden is a naturally formed or artificially excavated shallow-recessed green land, and is used for gathering and absorbing rainwater from a roof or the ground, filtering and purifying the rainwater through the comprehensive action of plants and sandy soil, and gradually permeating the rainwater into soil to contain underground water or make the rainwater supply urban water such as landscape water, toilet water and the like. Is an ecologically sustainable rain flood control and rain water utilization facility.

But impurities in the early stages of rain water can block the permeable layer.

The permeation layer is roughly divided into the following layers:

1. the covering layer is made of impurities such as leaves and the like covering the upper side, the covering layer is large in pore size, rainwater easily seeps down, and the covering layer has the function of moisturizing.

2. The planting layer is the root of the plant; when the layer is planted in the rainwater process, plant the infiltration speed that the layer can slow down the rainwater on the one hand, metal ion, nutrients, pollutant etc. in the rainwater on the other hand can be absorbed the degradation by the vegetation root on planting the layer. Because this layer is the place of vegetation, this layer soil property is soft relatively, so impurity in the rainwater is difficult for blockking up in this layer.

3. The sand bed, the sand bed is less because of the granule, and the rainwater is in the infiltration, and the great pollutant of some granules will be detained on this layer, blocks up the sand bed, influences the infiltration speed.

4. The gravel layer is larger due to pores and is positioned at the lowest layer; the layer is convenient for water storage, and the stored water flows out through the pipeline for secondary use.

Through the analysis, the particle pollutants in the rainwater are easy to gather in the gaps in the sand layer; and the water absorption effect of the rainwater garden is seriously influenced after the accumulated use for several years.

An ordinary rainwater garden is provided with an overflow pipe, if rainwater is more, redundant rainwater is drained through the overflow pipe, and the drained water is not purified; to some extent, the original intention of constructing a rainwater garden is violated.

Therefore, the rainwater secondary use type rainwater garden suitable for sponge city construction is designed to solve the problems.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention discloses a rainwater secondary use type rainwater garden suitable for sponge city construction, which is realized by adopting the following technical scheme.

In the invention, the front, the back, the left and the right are respectively the front end of the first collecting pipe and the end of the second collecting pipe extending out of the pit body, and the left end of the overflow pipe extending out of the pit body.

A rainwater secondary use type rainwater garden suitable for sponge city construction comprises a pit body, a covering layer, a planting layer, a sand layer, a gravel layer and an overflow pipe, wherein the gravel layer, the sand layer, the planting layer and the covering layer are sequentially distributed in the pit body from bottom to top; the overflow pipe is arranged at the upper end of the bottom surface of the pit body and is positioned at the upper side of the planting layer; one end of the overflow pipe is positioned in the pit body, and the other end of the overflow pipe is positioned outside the pit body; the method is characterized in that: a partition plate is fixedly arranged in the pit body, and the vertical partition plate divides the gravel layer and the sand layer into a left part and a right part which are separated; the transverse partition plate also separates the sand layer on the right side from the planting layer, and one side of the transverse partition plate close to the pit wall is higher than one side of the transverse partition plate close to the vertical partition plate; the rainwater drainage device comprises two separated sand layers, wherein a plurality of soil loosening units are uniformly arranged in the sand layer at the left side part, and a plurality of drainage units which are used for introducing rainwater exceeding the normal bearing range into the sand layer at the right side of the partition plate are uniformly arranged at the upper side of the sand layer at the right side part; the upper end of the drainage unit penetrates out of the covering layer, and the lower end of the drainage unit is positioned at the lower side of the transverse partition plate.

A first collecting pipe and a second collecting pipe are arranged in the gravel layer in the pit body, and the first collecting pipe and the second collecting pipe are respectively positioned at the left side and the right side of the partition plate; one end of the first collecting pipe and one end of the second collecting pipe penetrate out of the pit body.

The soil loosening unit comprises a fixed support, an installation rotating shaft, a roller, a connecting arc plate, a fixed gear, a transmission gear and an installation shaft, wherein the installation rotating shaft is rotatably installed in the pit body, the fixed gear is fixedly installed in the sand layer through the fixed support, and the fixed gear is in rotating fit with the installation rotating shaft; the two mounting shafts are rotatably mounted on the outer circular surface of the mounting rotating shaft in a 90-degree distribution manner, the outer circular surfaces of the rollers are provided with protrusions, the two rollers are fixedly mounted on the two mounting shafts respectively, the two transmission gears are mounted on the two mounting shafts respectively and are positioned on the lower sides of the fixed gears, and the two transmission gears are meshed with the fixed gears; two installation axles are kept away from the one end of installation pivot and are installed and connect the arc board, and two installation axles are rotation fit with connecting the arc board.

As a further improvement of the present technology, the bottom surface of the pit body has a cement layer; the set casing fixed mounting is in the cement layer, and the lower extreme rotary mounting of installation pivot is in the set casing.

As a further improvement of the technology, a third sealing ring is arranged between the fixed shell and the cement layer, and a second sealing ring is arranged between the installation rotating shaft and the fixed shell.

As a further improvement of the technology, a fixed sleeve is fixedly arranged on the mounting rotating shaft, and one ends of the two mounting shafts, which are far away from the connecting arc plate, are rotatably arranged on the fixed sleeve; the fixing sleeve is positioned on the upper side of the covering layer.

As a further improvement of the technology, the upper end of the mounting rotating shaft is provided with a hexagonal groove, and the top cover is nested and mounted at the upper end of the mounting rotating shaft.

As a further improvement of the technology, the drainage unit comprises a rain cover, a filter shell, a fixed ring shell, a partition plate, a water pipe, a spiral piece, a mounting plate and a connecting plate, wherein the upper end of the water pipe is provided with a gap, the lower end of the water pipe penetrates through the upper end face of the partition plate and is positioned in a sand layer on the right side after being separated by the partition plate, and the upper end of the water pipe penetrates through the planting layer and is positioned on the upper side of the planting layer; the fixed ring shell is fixedly arranged at the upper end of the water pipe, the isolation plate is slidably arranged on the fixed ring shell, and one end of the isolation plate is positioned in the fixed ring shell and matched with the notch on the water pipe; the filter shell is rotatably arranged on the upper side of the water pipe, the lower end of the rain cover is fixedly provided with an installation plate through a plurality of uniformly distributed connection plates, and the installation plate is rotatably arranged on the upper side of the filter shell in a detachable mode; a spiral sheet is fixedly arranged on the lower side of the rain cover, and the lower end of the spiral sheet is positioned in the filter shell; the filter shell is internally provided with sand with particles larger than the sand particles in the sand layer.

As a further improvement of the technology, the lower end of the filter shell is provided with a nesting ring groove, and the filter shell is nested and installed at the upper end of the water pipe through the nesting ring groove.

As a further improvement of the technology, a plurality of L-shaped nested arc plates are uniformly arranged on the lower side of the mounting plate in the circumferential direction; a plurality of installation arc plates are uniformly arranged at the upper end of the filter shell in the circumferential direction; the rain cover is rotatably arranged on the upper side of the filter shell through the matching of the installation arc plate on the lower side of the installation plate and the nested arc plate; the arc length of the nested arc plates is equal to the arc length of the gap between two adjacent mounting arc plates.

As a further improvement of the technology, one end of the isolation plate is provided with a shielding circular plate which is matched with the water pipe; the diameter of the spiral piece is nine-eighth of the inner diameter of the filter shell.

As a further improvement of the technology, the upper side of the cement layer is provided with a waterproof layer, and a first sealing ring is arranged between the fixed shell and the waterproof layer.

Compared with the traditional rainwater garden technology, the design of the invention has the following beneficial effects:

1. the soil loosening unit is arranged in the sand layer, and after the sand layer is used for a period of time, the left sand layer is loosened through the soil loosening unit, so that the purification effect of the sand layer is improved; when the sand layer is loosened, after the sand layer is dried in the sun, the auxiliary driving mechanism drives the mounting rotating shafts in the soil loosening units to rotate in a reciprocating manner in sequence; the installation pivot is rotatory to drive two running rollers round installation pivot axis rotatory, and the running roller carries out the rotation round the rotatory in-process of installation pivot simultaneously, through the rotation of running roller with round the rotation of installation pivot to the sand bed loosen the soil and turn over native.

2. According to the rainwater purification device, the drainage unit is designed, rainwater in heavy rain weather and beyond the normal purification range of the rainwater garden is introduced into the sand layer on the right side of the partition plate through the drainage unit, and the rainwater is purified to a certain degree through the sand layer on the right side, so that the rainwater is poorer than normal filtered rainwater, but better than unpurified rainwater; compared with the traditional rainwater garden, the rainwater garden has the advantages that part of rainwater purified to a certain degree is added besides normal purified rainwater, and the purification effect is relatively good.

3. According to the invention, the position of the soil loosening unit is reasonably arranged, so that the sand layer on the left side of the partition plate can be basically loosened.

4. The invention designs the meshing of the fixed gear and the lower side transmission gear, and ensures that the front surface sand layer can be pressed down and the lower side sand layer can be turned up from the rear side due to the rotation direction of the roller in the swinging process.

Drawings

Fig. 1 is an external view of an entire part.

Fig. 2 is a schematic view of the overall component distribution.

Fig. 3 is a schematic distribution diagram of the soil loosening unit and the drainage unit.

Fig. 4 is an appearance schematic diagram of the ripping unit.

Fig. 5 is a schematic structural diagram of the soil loosening unit.

Fig. 6 is a schematic view of the internal structure of the housing.

Fig. 7 is an external view of the drainage unit.

FIG. 8 is a schematic view of a flight installation.

Fig. 9 is a schematic structural diagram of the rain cover, the filter shell, the partition plate and the water pipe.

Fig. 10 is a schematic view of the combination of the soil loosening unit, the drainage unit and the soil layer.

Fig. 11 is a schematic view of the working principle of the ripping unit.

Fig. 12 shows the excellent quality of the filtered water.

Number designation in the figures: 1. a pit body; 2. a drainage unit; 3. a soil loosening unit; 4. an overflow pipe; 5. a first collection tube; 6. a second collection tube; 7. a cover layer; 8. planting a layer; 9. a sand layer; 10. a gravel layer; 11. a partition plate; 12. fixing and supporting; 13. installing a rotating shaft; 14. a stationary case; 15. a cement layer; 16. a waterproof layer; 17. a first seal ring; 18. a second seal ring; 19. a third seal ring; 20. a top cover; 21. a roller; 22. connecting the arc plates; 23. a hexagonal groove; 24. fixing a gear; 25. a housing; 26. fixing a sleeve; 27. a transmission gear; 28. a rain cover; 29. a filter shell; 30. a stationary ring housing; 31. a separator plate; 32. a water pipe; 33. a spiral sheet; 34. nesting the arc plates; 35. mounting a plate; 36. a connecting plate; 37. a shielding circular plate; 38. a notch; 39. installing an arc plate; 40. nesting the ring grooves; 41. installing a shaft; 42. and (4) protruding.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples or figures are illustrative of the present invention and are not intended to limit the scope of the present invention.

As shown in fig. 1, it comprises a pit body 1, a covering layer 7, a planting layer 8, a sand layer 9, a gravel layer 10 and an overflow pipe 4, wherein as shown in fig. 2 and 10, the gravel layer 10, the sand layer 9, the planting layer 8 and the covering layer 7 are distributed in the pit body 1 from bottom to top in sequence; the overflow pipe 4 is arranged at the upper end of the bottom surface of the pit body 1 and is positioned at the upper side of the planting layer 8; one end of the overflow pipe 4 is positioned in the pit body 1, and the other end of the overflow pipe 4 is positioned outside the pit body 1; the method is characterized in that: as shown in fig. 2, a partition plate 11 is fixedly installed in the pit body 1, and the vertical partition plate 11 divides the gravel layer 10 and the sand layer 9 into two parts which are separated from each other left and right; the horizontal partition plate 11 also separates the right sand layer 9 from the planting layer 8, and one side of the horizontal partition plate 11 close to the pit wall is higher than one side close to the vertical partition plate 11; as shown in fig. 2 and 3, the two sand layers 9 are separated, a plurality of soil loosening units 3 are uniformly arranged in the sand layer 9 at the left part, and a plurality of drainage units 2 for guiding rainwater exceeding the normal bearing range into the sand layer 9 at the right side of the partition plate 11 are uniformly arranged at the upper side of the sand layer 9 at the right part; the upper end of the drainage unit 2 penetrates out of the covering layer 7, and the lower end of the drainage unit is positioned at the lower side of the transverse partition plate 11.

Rainwater entering the rainwater garden sequentially passes through the covering layer 7, the planting layer 8 and the sand layer 9 and enters the gravel layer 10 at the lowest layer; the infiltration speed of the rainwater is mainly determined by the planting layer 8; the infiltration speed of rainwater in the planting layer 8 is relatively slow, and the infiltration speeds of the sand layer 9 and the gravel layer 10 are both fast, so that basically no rainwater is retained in the sand layer 9, and the sand layer 9 is often in an unsaturated state; therefore, normal rainwater infiltration can be met through a part of the sand layer 9, and the whole sand layer 9 is not needed; therefore, the gravel layer 10 and the sand layer 9 are divided into a left part and a right part by the partition plate 11, and normal rainwater is purified by the planting layer 8 and the sand layer 9 on the left part.

According to the rainwater rapid drainage system, the drainage unit 2 is designed, rainwater in heavy rain weather and exceeding the normal purification range of the rainwater garden directly crosses the planting layer 8 through the drainage unit 2 and is introduced into the sand layer 9 on the right side of the partition plate 11, and the rainwater is rapidly purified to a certain extent through the sand layer 9 on the right side, as shown in fig. 12, the rainwater is poorer than rainwater which is normally filtered, but is better than the rainwater which is not purified, and the rainwater is faster because the rainwater is not filtered through the planting layer 8, so that the purpose of rapid drainage is met. Compared with the traditional rainwater garden, the rainwater garden has the advantages that part of rainwater purified to a certain degree is added besides normal purified rainwater, and the purification effect is relatively good.

The overflow pipe 4 designed by the invention has the effect that in the case of heavy rainstorm, the rainwater in the pit body 1 exceeds the range which can be borne by the rainwater garden, and the rainwater cannot be completely absorbed and purified after passing through the drainage unit 2, so that the rainwater can only flow away through the overflow pipe 4 in the state, and the rainwater is relatively poor in non-purification.

As shown in fig. 1, a first collecting pipe 5 and a second collecting pipe 6 are installed in a gravel layer 10 in the pit body 1, and the first collecting pipe 5 and the second collecting pipe 6 are respectively positioned at the left side and the right side of a partition plate 11; one ends of the first collecting pipe 5 and the second collecting pipe 6 penetrate out of the pit body 1.

In the invention, rainwater which normally passes through the planting layer 8 and the sand layer 9 and is purified is collected into the water storage shell through the first collecting pipe 5 for secondary use. In the invention, the rainwater which is only filtered by the right sand layer 9 to a certain degree is collected by the second collecting shell and is used in places with low water quality requirements.

As shown in fig. 4 and 5, the ripping unit 3 includes a fixed support 12, a mounting shaft 13, a roller 21, a connecting arc 22, a fixed gear 24, a transmission gear 27, and a mounting shaft 41, wherein the mounting shaft 13 is rotatably mounted in the pit body 1, as shown in fig. 6, the fixed gear 24 is fixedly mounted in the sand layer 9 through the fixed support 12, and the fixed gear 24 is rotatably engaged with the mounting shaft 13; the two mounting shafts 41 are rotatably mounted on the outer circumferential surface of the mounting rotating shaft 13 in a 90-degree distribution, the outer circumferential surface of the roller 21 is provided with a protrusion 42, the two rollers 21 are respectively and fixedly mounted on the two mounting shafts 41, the two transmission gears 27 are respectively mounted on the two mounting shafts 41, the two transmission gears 27 are located on the lower side of the fixed gear 24, and the two transmission gears 27 are meshed with the fixed gear 24; the connecting arc plate 22 is installed at one end of the two installation shafts 41 far away from the installation rotating shaft 13, and the two installation shafts 41 and the connecting arc plate 22 are both in rotating fit.

In the invention, the roller 21 rotates around the mounting rotating shaft 13, and simultaneously, the soil loosening effect is improved through rotation. The invention has the function of arranging the bulge 42 on the roller 21 to improve the soil loosening effect.

As shown in fig. 3, the pit body 1 has a cement layer 15 on the bottom surface thereof; the fixed shell 14 is fixedly arranged in the cement layer 15, and the lower end of the installation rotating shaft 13 is rotatably arranged in the fixed shell 14. The cement layer 15 is arranged to provide a fixed platform for mounting the lower end of the rotating shaft 13.

As shown in fig. 5, a third seal ring 19 is installed between the fixed casing 14 and the cement layer 15, and a second seal ring 18 is installed between the installation shaft 13 and the fixed casing 14. The third sealing ring 19 is used for sealing the fixed shell 14 and the cement layer 15; the second seal ring 18 seals between the mounting shaft 13 and the stationary housing 14.

As shown in fig. 5, the fixing sleeve 26 is fixedly mounted on the mounting shaft 13, and one ends of the two mounting shafts 41 far from the connecting arc plate 22 are rotatably mounted on the fixing sleeve 26; said anchoring sleeve 26 is located on the upper side of the covering layer 7.

As shown in fig. 5, the upper end of the mounting shaft 13 is provided with a hexagonal groove 23, and the top cover 20 is nested on the upper end of the mounting shaft 13. The hexagonal groove 23 is used for facilitating the rotation of the mounting rotating shaft 13 driven by people through an auxiliary driving mechanism. The top cover 20 is used for preventing rainwater from entering the hexagonal groove 23 and corroding the upper end of the installation rotating shaft 13.

As shown in fig. 7 and 8, the drainage unit 2 includes a rain cover 28, a filter shell 29, a fixed ring shell 30, a partition plate 31, a water pipe 32, a spiral sheet 33, a mounting plate 35, and a connecting plate 36, wherein as shown in fig. 9, the upper end of the water pipe 32 has a gap 38, the lower end of the water pipe 32 passes through the upper end surface of the partition plate 11 and is located in the sand layer 9 on the right side after being isolated by the partition plate 11, and the upper end of the water pipe 32 passes through the planting layer 8 and is located on the upper side of the planting layer 8; as shown in fig. 8, the fixing ring housing 30 is fixedly installed at the upper end of the water pipe 32, the isolation plate 31 is slidably installed on the fixing ring housing 30, and one end of the isolation plate is located in the fixing ring housing 30 and is matched with the notch 38 on the water pipe 32; the filter shell 29 is rotatably mounted on the upper side of the water pipe 32, the lower end of the rain cover 28 is fixedly provided with a mounting plate 35 through a plurality of uniformly distributed connecting plates 36, and the mounting plate 35 is rotatably mounted on the upper side of the filter shell 29 in a detachable manner; a spiral sheet 33 is fixedly arranged at the lower side of the rain cover 28, and the lower end of the spiral sheet 33 is positioned in the filter shell 29; the filter housing 29 has sand therein having a particle size greater than the sand particle size in the sand layer 9. This sand bed 9 has guaranteed drainage speed when carrying out simple filtration to the rainwater.

The rain cover 28 of the invention has the function of preventing rainwater from directly entering the water pipe 32, so that the rainwater enters the planting layer 8 and is firstly purified by the planting layer 8, and when more rainwater is arranged on the upper side of the planting layer 8, the water level rises and then enters the water pipe 32 from the gap between the lower side of the rain cover 28 and the mounting plate 35.

In the invention, during heavy rain, rainwater on the upper side of the planting layer 8 is more, rainwater on the upper side cannot be purified normally, and the rainwater on the upper side is relatively turbid, so that the rainwater on the upper side enters the water pipe 32 from a gap between the lower side of the rain cover 28 and the mounting plate 35, is simply filtered through the sand layer 9 in the filter shell 29, and then enters the sand layer 9 on the right side of the partition plate 11 through the water pipe 32 to be purified to a certain degree.

As shown in fig. 9, the filter shell 29 has a nesting ring groove 40 at the lower end, and the filter shell 29 is nested in the upper end of the water pipe 32 through the nesting ring groove 40.

As shown in fig. 9, a plurality of L-shaped nesting arc plates 34 are uniformly circumferentially mounted on the lower side of the mounting plate 35; a plurality of mounting arc plates 39 are uniformly arranged at the upper end of the filter shell 29 in the circumferential direction; the rain cover 28 is rotatably arranged on the upper side of the filter shell 29 through the matching of the mounting arc plate 39 on the lower side of the mounting plate 35 and the nesting arc plate 34; the arc length of the nesting arc plate 34 is equal to the arc length of the gap between two adjacent mounting arc plates 39. When the rain cover 28 is installed, firstly, the L-shaped nested arc plates 34 on the lower side of the rain cover 28 are aligned to gaps between the adjacent installation arc plates 39 on the filter shell 29, the rain cover 28 is pressed downwards, the L-shaped nested arc plates 34 are clamped in the gaps between the adjacent installation arc plates 39, then the rain cover 28 is rotated, the lower ends of the L-shaped nested arc plates 34 are clamped on the lower sides of the installation arc plates 39, and the installation of the rain cover 28 is completed; when the filter casing is taken down, the rain cover 28 is firstly rotated, so that the L-shaped nested arc plates 34 on the lower side of the rain cover 28 are aligned with the gaps between the adjacent installation arc plates 39 on the filter casing 29, and then the rain cover 28 is taken up upwards.

As shown in fig. 9, one end of the isolation plate 31 has a shielding circular plate 37, and the shielding circular plate 37 is engaged with the water pipe 32; the diameter of the spiral sheet 33 is nine-eighth of the inner diameter of the filter shell 29; the diameter of the spiral piece 33 is nine-eighth of the inner diameter of the filter shell 29 to improve the stirring effect.

As shown in fig. 3, a waterproof layer 16 is provided on the upper side of the cement layer 15, and a first sealing ring 17 is installed between the fixing shell 14 and the waterproof layer 16; the waterproof layer 16 serves to prevent rainwater stored in the gravel layer 10 after being purified, and the first sealing ring 17 serves to seal between the fixing case 14 and the waterproof layer 16.

According to the invention, the positions of the soil loosening units 3 are reasonably arranged, so that the sand layers 9 on the left sides of the partition plates 11 can be completely loosened.

The auxiliary driving mechanism in the invention is a conventional device capable of outputting rotary motion through external power.

The horizontal partition plate 11 also separates the right sand layer 9 from the planting layer 8, and one side of the horizontal partition plate 11 close to the pit wall is higher than one side close to the vertical partition plate 11; the purpose of this design is to ensure that rainwater filtered through the planting layer 8 on the upper side of the partition 11 can flow into the left sand layer 9 under the effect of the installation of the transverse partition 11.

In the present invention, the entire drainage unit 2 is located on the upper side of the cover layer 7, which is designed for easy disassembly.

The specific working process is as follows: when the rainwater garden designed by the invention is used, rainwater can sequentially pass through the covering layer 7, the planting layer 8 and the sand layer 9 on the left side of the clapboard 11 to enter the gravel layer 10 on the left side of the clapboard 11 at the lowest layer in normal rainy days; the rainwater is purified by the planting layer 8 and the sand layer 9 at the left side part.

In heavy rain, rainwater exceeding the normal purification range of the rainwater garden enters the water pipe 32 from the gap between the lower side of the rain cover 28 and the mounting plate 35, is simply filtered through the sand layer 9 in the filter shell 29, and then enters the sand layer 9 on the right side of the partition plate 11 through the water pipe 32, and is purified to a certain extent through the sand layer 9 on the right side of the partition plate 11. This fraction is inferior to normal filtered rainwater, but better than unpurified rainwater.

After a plurality of times of heavy rains, the upper side of the sand layer 9 in the filter shell 29 is blocked by impurities, in this case, after the sand layer 9 in the filter shell 29 is dried in the sun, the rain cover 28 is manually rotated, the rain cover 28 drives the spiral sheet 33 to stir the sand layer 9 on the upper side in the filter shell 29, the blocked impurities are mixed in the sand layer 9 on the upper side of the filter shell 29 through stirring, and the sand layer 9 on the upper side of the filter shell 29 has a filtering function again. During stirring, the rain cover 28 is pressed, so that the upper end face of the L-shaped nested arc plate 34 is tightly attached to the upper end face of the installation arc plate 39, and the rain cover 28 is prevented from falling off. After more rainstorms, the impurities in the sand layer 9 in the filter shell 29 are too much to be mixed and cannot be used for filtering again; at this time, a section of the partition plate 31 having the shielding circular plate 37 is manually pushed into the water pipe 32, so that the partition plate 31 seals the lower end of the water pipe 32, and then the sand layer 9 on the upper side in the filter housing 29 is taken out and replaced.

After the soil loosening unit is used for a period of time, the sand layer 9 on the left side needs to be loosened, and when the sand layer 9 is loosened, after the sand layer 9 is dried in the sun, the installation rotating shafts 13 in all the soil loosening units 3 are sequentially driven through the auxiliary driving mechanism, so that the installation rotating shafts 13 rotate in a reciprocating manner; the mounting rotating shaft 13 drives the fixing sleeve 26 to rotate, the fixing sleeve 26 drives the two mounting shafts 41 to rotate, the two mounting shafts 41 rotate to drive the two transmission gears 27 to rotate around the axis of the mounting rotating shaft 13, in the process that the two transmission gears 27 rotate around the axis of the mounting rotating shaft 13, the two transmission gears 27 can rotate under the action of the fixed gear 24, and the two transmission gears 27 rotate to drive the two rollers 21 to rotate; as shown in fig. 11, the sand layer 9 is loosened by the rotation of the roller 21 and the rotation around the installation rotation shaft 13.

Claims

1. A rainwater secondary use type rainwater garden suitable for sponge city construction comprises a pit body, a covering layer, a planting layer, a sand layer, a gravel layer and an overflow pipe, wherein the gravel layer, the sand layer, the planting layer and the covering layer are sequentially distributed in the pit body from bottom to top; the overflow pipe is arranged at the upper end of the bottom surface of the pit body and is positioned at the upper side of the planting layer; one end of the overflow pipe is positioned in the pit body, and the other end of the overflow pipe is positioned outside the pit body; the method is characterized in that: a partition plate is fixedly arranged in the pit body, and the vertical partition plate divides the gravel layer and the sand layer into a left part and a right part which are separated; the transverse partition plate also separates the sand layer on the right side from the planting layer, and one side of the transverse partition plate close to the pit wall is higher than one side of the transverse partition plate close to the vertical partition plate; the rainwater drainage device comprises two separated sand layers, wherein a plurality of soil loosening units are uniformly arranged in the sand layer at the left side part, and a plurality of drainage units which are used for introducing rainwater exceeding the normal bearing range into the sand layer at the right side of the partition plate are uniformly arranged at the upper side of the sand layer at the right side part; the upper end of the drainage unit penetrates out of the covering layer, and the lower end of the drainage unit is positioned at the lower side of the transverse partition plate;

a first collecting pipe and a second collecting pipe are arranged in the gravel layer in the pit body, and the first collecting pipe and the second collecting pipe are respectively positioned at the left side and the right side of the partition plate; one ends of the first collecting pipe and the second collecting pipe penetrate out of the pit body;

2. The rainwater secondary use type rainwater garden suitable for sponge city construction according to claim 1, characterized in that: a cement layer is arranged on the bottom surface of the pit body; the set casing fixed mounting is in the cement layer, and the lower extreme rotary mounting of installation pivot is in the set casing.

3. The rainwater secondary use type rainwater garden suitable for sponge city construction according to claim 2, characterized in that: and a third sealing ring is arranged between the fixed shell and the cement layer, and a second sealing ring is arranged between the installation rotating shaft and the fixed shell.

4. The rainwater secondary use type rainwater garden suitable for sponge city construction according to claim 1, characterized in that: the mounting rotating shaft is fixedly provided with a fixing sleeve, and one ends of the two mounting shafts, which are far away from the connecting arc plate, are rotatably arranged on the fixing sleeve; the fixing sleeve is positioned on the upper side of the covering layer.

5. The rainwater secondary use type rainwater garden suitable for sponge city construction according to claim 1, characterized in that: the upper end of the mounting rotating shaft is provided with a hexagonal groove, and the top cover is nested and mounted at the upper end of the mounting rotating shaft.

6. The rainwater secondary use type rainwater garden suitable for sponge city construction according to claim 1, characterized in that: the drainage unit comprises a rain cover, a filter shell, a fixed ring shell, a partition plate, a water pipe, a spiral sheet, an installation plate and a connection plate, wherein the upper end of the water pipe is provided with a notch, the lower end of the water pipe penetrates through the upper end face of the partition plate and is positioned in a sand layer on the right side after being isolated by the partition plate, and the upper end of the water pipe penetrates through the planting layer and is positioned on the upper side of the planting layer; the fixed ring shell is fixedly arranged at the upper end of the water pipe, the isolation plate is slidably arranged on the fixed ring shell, and one end of the isolation plate is positioned in the fixed ring shell and matched with the notch on the water pipe; the filter shell is rotatably arranged on the upper side of the water pipe, the lower end of the rain cover is fixedly provided with an installation plate through a plurality of uniformly distributed connection plates, and the installation plate is rotatably arranged on the upper side of the filter shell in a detachable mode; a spiral sheet is fixedly arranged on the lower side of the rain cover, and the lower end of the spiral sheet is positioned in the filter shell; the filter shell is internally provided with sand with particles larger than the sand particles in the sand layer.

7. The rainwater secondary use type rainwater garden suitable for sponge city construction according to claim 6, characterized in that: the lower end of the filter shell is provided with a nesting ring groove, and the filter shell is nested and installed at the upper end of the water pipe through the nesting ring groove.

8. The rainwater secondary use type rainwater garden suitable for sponge city construction according to claim 6, characterized in that: a plurality of L-shaped nested arc plates are uniformly arranged on the lower side of the mounting plate in the circumferential direction; a plurality of installation arc plates are uniformly arranged at the upper end of the filter shell in the circumferential direction; the rain cover is rotatably arranged on the upper side of the filter shell through the matching of the installation arc plate on the lower side of the installation plate and the nested arc plate; the arc length of the nested arc plates is equal to the arc length of the gap between two adjacent mounting arc plates.

9. The rainwater secondary use type rainwater garden suitable for sponge city construction according to claim 6, characterized in that: one end of the isolation plate is provided with a shielding circular plate which is matched with the water pipe; the diameter of the spiral piece is nine-eighth of the inner diameter of the filter shell.

10. The rainwater secondary use type rainwater garden suitable for sponge city construction according to claim 2, characterized in that: the waterproof layer is arranged on the upper side of the cement layer, and a first sealing ring is arranged between the fixing shell and the waterproof layer.